Just an idea. Maybe you should try the stronglifts 5x5. You increase your bench press 2.5 or 5kg each time. I was the same as you. I still don't bench, squat or deadlift much I squat 178lbs/80kg and bench 115lbs/50kg 5x5. My 1 rep max is a lot more. Just an idea for that worked for me. And I'm only doing this a few weeks.